Abstract
Two-dimensional transition metal carbides/nitrides, known as MXenes, have been recently receiving attention for gas sensing. However, studies on hybridization of MXenes and 2D transition metal dichalcogenides as gas-sensing materials are relatively rare at this time. Herein, Ti3C2Tx and WSe2 are selected as model materials for hybridization and implemented toward detection of various volatile organic compounds. The Ti3C2Tx/WSe2 hybrid sensor exhibits low noise level, ultrafast response/recovery times, and good flexibility for various volatile organic compounds. The sensitivity of the hybrid sensor to ethanol is improved by over 12-fold in comparison with pristine Ti3C2Tx. Moreover, the hybridization process provides an effective strategy against MXene oxidation by restricting the interaction of water molecules from the edges of Ti3C2Tx. An enhancement mechanism for Ti3C2Tx/WSe2 heterostructured materials is proposed for highly sensitive and selective detection of oxygen-containing volatile organic compounds. The scientific findings of this work could guide future exploration of next-generation field-deployable sensors.
Highlights
Two-dimensional transition metal carbides/nitrides, known as MXenes, have been recently receiving attention for gas sensing
The Ti3C2Tx/WSe2 nanohybrids were further prepared as ink for the inkjet printing and the fabrication of flexible volatile organic compounds (VOCs) sensors operating at room temperature using a wireless monitoring system (Fig. 1b)
MXenes tend to oxidize in a humid environment, but adequate loading of transitionmetal dichalcogenides (TMDs) nanoflakes to edges of MXene nanosheets provides an effective strategy to block the direct interaction of H2O with MXenes, which is an approach to promoting MXene materials for real-life applications
Summary
Two-dimensional transition metal carbides/nitrides, known as MXenes, have been recently receiving attention for gas sensing. Because of a combination of properties such as stable and tunable microstructure, high electrical conductivity, large chemically active surface, and adjustable hydrophilicity, lowdimensional MXenes and MXene-based nanocomposites have recently received considerable attention to catalysis[5,6,7], energy conversion/storage[8,9,10], and biomedical applications[11,12,13] Their application to gas sensor design, is rarely studied, and only focuses on pristine MXenes (Ti3C2Tx, V2CTx, and Ti2CO2)[14,15,16]. A massproduction integration process (liquid-phase exfoliation and inkjet printing) and wireless operation of Ti3C2Tx/WSe2 sensors at room temperature is demonstrated, opening an effective avenue for the development of high-performance sensing devices for next-generation IoTs
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